AirHint found the following cheapest one-way flights from San Francisco (SFO) to Lisbon (LIS) in December 2025 (see full year).

One-Way flights

28 Dec	British Airways
29 Dec	British Airways
15 Dec	British Airways
11 Dec	British Airways
12 Dec	British Airways
04 Dec	British Airways
05 Dec	British Airways
27 Dec	British Airways
29 Dec	TAP	direct
12 Dec	TAP	direct

Also check the deals for return flights from San Francisco to Lisbon in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest one-way flights from San Francisco to Lisbon in December from 273€

One-Way flights